Spray gun and method of spraying



4 A. J. LAMPE 2,433,43

SPRAY GUN AND METHOD OF SP RAYING Filed Oct. 5, 1944 2 Sheets-Sheet 1 30 INVENTOR.

ww wvm Dec. 30, 1947. A. J. LAMPE 2,433,463

- SPRAY GUN AND METHOb 0F SPRAYING Filed Oct. 5, 1944 2 Sheds-Sheet 2 ,llllllq Patented Dec. 30, 1947 SPRAY GUN AND METHOD OF SPRAYING Arthur J. Lampe, Chicago, Ill., assignor to Sprayo- Flake Company, Chicago, 111., a corporation of Illinois Application October 5, 1944, Serial No. 557,278

6 Claims. 1

The present invention relates to improvements in spray guns. More particularly, it pertains to a spray gun adapted simultaneously to project particles of material and sprays of adhesive into a chosen path, each spray converging in different areas more effectively to render the comminutecl particles adherent for application to selected surfaces, and the provision of such a spray gun is a principal object of the invention.

More specifically, it is an object of the invention to provide a spray gun, and new method of operating the same, adapted to project particles of material from a nozzle equipped with a multiple-jet spray gun head, the jets being circumferentially arranged in alternately pitched relationship around the end of the nozzle, whereby simultaneously to project a plurality of converging sprays of adhesive against the material in a manner such that one of the sprays will converge in advance of the other more effectively to render the particles adherent for application to selected surfaces. 7

Other objects of the invention will in part be obvious and will in part appear hereinafter.

The invention accordingly comprises the fea-' tures of construction, combination of elements, and arrangement of parts, which will be exemplified in the construction hereinafter set forth and the scope of the application of which will be indicated in the claims.

For a fuller understanding of the nature and objects of the invention reference should be had to the following detailed description, taken in connection with the accompanying drawings, in which:

Fig. 1 is a plan view of the operating end of a spray gun embodying the present invention;

Fig. 2 is a sectional plan view, similar to Fig, l, somewhat enlarged for purpose of illustration;

Fig. 3 is a front view of the spray gun shown in Fig. 1; and

Fig. 4 is a diagrammatic illustration of the manner in which the spray gun is adapted simultaneously to project comminuted material and cone-like sprays of adhesive.

The type of spray gun herein depicted is particularly useful, for example, for heat insulation purposes, and, otherwise building up mats of comminuted materials on selected surfaces, as illustrated in the patents to Wenzel et al., Nos. 1,718,507, 1,888,841, 2,179,678; the patent to Fix, No. 1,837,422; and the patent to Bennett, No. 1,978,125.

Referring more particularly to the drawings,

there is indicated generally at H] a preferred embodiment of the spray gun contemplated by the present invention. This comprises a cylindrical pipe, or nozzle, II. A granular, comminuted, or macerated material, the latter being preferably of a fibrous nature, is projected through the pipe by means of a motor driven blower. The blower and associated means are not shown in the drawings since they are all fully disclosed in the above mentioned patents and the description in this respect needs no further elaboration.

Attached to the end of the pipe is a multiplejet spray gun head indicated generally t This head preferably comprises a cylindrical member l3 having secured thereto a suitable cap it, separated by a gasket Hi. The cap [4 maybe secured to the member l3 by any suitable means, for example, a bolt and nut arrangement 11. The cylindrical member I3 is chambered as indicated at It! to receive a suitable adhesive fed through a pipe I9 under variable pressure. The member l3 also contains an air chamber 20 which is fed with compressed air through a pipe 2|.

Mounted in the face of the cap l4 are a number of alternately pitched atomizing jets l5 and 30. Preferably, these jets are screw-threaded into the cap It. Around the intermediate portion of each jet is an annular orifice 22 leading to channels 23, 23 which communicate with a central aperture 24 in the jet which has a spray outlet 25. Preferably the outlet 25 is countersunk in any suitable manner in order to expand the conelike spread of the spray. Screw-threaded into the rear of each jet [5 and 30 is a member 26 having a longitudinal opening 21 therein connecting the adhesive chamber I 8 with the central aperture 24. The annular orifice 22 is brought into communication with the compressed air chamber 20 through channels 21. By this arrangement the compressed air, as it is by-passed through the jets l5 and 30, atomizes the adhesive coming from the chamber l8 and projects the same in a conelike spray. Simultaneously therewith the comminuted material is blown, or projected, into space through a chosen path traversed by a plurality of converging sprays of adhesive wherein one spray is adapted to converge in advance of the other, as more fully indicated in Fig. 4 of the drawings,

The spray gun herein described is illustrated as having six spray jets in the head I2 surrounding the nozzle II in which the three alternate jets l5 are pitched preferably to converge approximately thirty inches from the head. The other three alternate jets 30 preferably are pitched to converge fifteen inches from the head. Obviously the gun need not necessarily have a, total of six jets but must have at least two to produce the novel effect described.

Of particular significance i the spacing and pitching arrangement .of .the jets. l5 andjfl, as is more fully disclosed diagrammatically in Fig. .of .1 the drawings. For example, by pitching the'jets 15 so that they converge with the spray of come...

minuted material at a point about thirty inches from the opening of the pipe lil,iandsbylpitchingr the jets 38 so that they converge with the spray. of comminuted material at arpoint about fifteen.

inches from the pipe I I, an ideal'arrangement for suitably coating the comminuted material will be obtained. These distances are conveniently indi---- There is thus provided-la,

cated at I5" and 30". means to project comminuted material into space through a chosen path and simultaneously to pro-.

ject; a plurality of. convergingsprays 'of adhesive" intorthe same pathso that oneof'the sprays will converge in advance. "of the other;- whereby the material can" be rendered suitablyradherent for" application'toselectedsurfaces? In practice" it' has beerrfo urld"that a gunenrbodyingthe tprinciples'of--thepresent inventionhas many. advantages: Foriexample; there is-provided'a distinct convergingconedik spray'of ad:

hesive through" which"thefibrous-material must pass, therebysuitably to bcoatedwithth ad' hesive 'before it reaches a selected surface on which it is to be: adheringly projectedr This muiti-coating" process insuresa considerable. re

taxicesi from the endiof the gun that :the gun becomes 'moremniversalini operation: That is; thedistance atlwhich'tliehead ofthe 'gunis held. from 'the surface 'on 'which the application of fibrous materialist beingma'de does not become so "critical; verging at about thirtyiinches; th head of;. the: gun must beheld about.thirty six' inches away afroin theselectedsurfaceto be coated to'obtair'r a;v proper'coating; A multiple-jehguncan be brought much closeriand still obtaima' proper coating of particles;"thereby makhi'git'possibletogetniuchbetterresultswhen'workingin restrictedi spaces;

Another importantil advantage: of the present; invention" is that'it-providesia novel method of operation: Forinstance,as"the gums directed; toward and alongfa selected-surface 'an outer: advancing wall ofthe -coneelikeispmy-primesthe; selected 'surface'forthereception for-the adherent particles regardlessicf'any horizontal or vertical c5 movement *of the gun; including "rotation of :the gun around ifiSf own longitudinalcaxist" At arrin termediate stage the'rfibe'rs; themselves "are lrene dered adherent "in passingthrough the -spray;--

Thereafter a following wall of the cone-likesp a 7"0" beoiotainedbecause more particiesof commilliitcd T 5" Normally, with a single: spraycon 5 material per minute can be handled and satisfactorily coated than would be possible with a single-jet gun.

It should be noted that different types of comminuted material would normally require a different technique and a difierent type of gun in conventional practice. However, the gun herein described is: versatile in ithat fall; six alternate pitch jets can be operated at once where a considerably greater proportion of adhesive to fiber i'sdesired with a fiber capable of being applied in large quantities over a very short period of time. By, inserting. blanknjets in either of the three alternately pitchedmoles in place of the jets I5 and 30;" the gun..is. immediately adaptable to handling fibrous materials requiring a much lesser'quantity of adhesive concentration. Also,

either set of pitched jets IE or 30 can be blocked out, thereby making it possibl to operate with the gun at a greater distance from the surface or quite close if sodesired, adaptingit to almost all working" conditions usuallyencountered. Of course, it will beappreciated-that different sized" nozzles or jets canbe used to vary the now of adhesive instead of'blocking 'outsome of them;

It will thusbe seenthat "the objects -hereinbefore set forth may: readily and efiicientlybe attained; and since certain'changes-may be made in the above construction and'different embodimerits of the -invention could be-made without departing'from'thescope thereof, it is intended that all matter contained in the above description, or shown" in theaccompanying drawings; shall be interpreted" as iilustrative and-not ina limiting sense.

It is also to be-understood that the'following claims are intended=tocoverall of the'generic and specific features of theinvention herein described, and all statements of the scope of the' invention which, as a matter of languageymight be' saidto fall therebetween:

Having described my invention, what I claim" space through a chosen path, and'means simul taneously to project a plurality of cone-like sprays of said adhesive, said adhesivesprays being differently pitched-relative to the chosen path of said material andconverging with the chosen path of said materialat diiferent points.- 2. In a gun of the type adapted to spray, a

divided'material' and a liquid adhesivewhereby said material is rendered adherent for'application: to selected surfaces,"theimprovement comprising means to project said 5 divided material into space through a'chosen path,and means,.in-. eluding a series of differently pitchedjets 00- operatively associated with said first named means; simultaneously toprojecta plurality of.

cone-like sprays of said adhesive said adhesive sprays being differently-pitched relative to the chosen path of saidmaterialland converging with. the chosen' path ofrsaidmaterial .at. different points.

3; In a gun;ofthetype adapteditospray a; divided material anda; liquid adhesive whereby, said material is rendered-adherent for application to selected surfaces, the improvement com-V prising a nozzle adapted .to project said divided" maiifilial" 'intwspace through'a chosen-= path,- and means, including a multiple-jet spray gun head having jets circumferentially arranged around the end of said nozzle, simultaneously to project a plurality of cone-like sprays of said adhesive, said adhesive sprays being diiferently pitched relative to the chosen path of said material and converging with the chosen path of said material at different points.

4. In a gun of the type adapted to spray a comminuted material and a liquid adhesive whereby said material is rendered adherent for application to selected surfaces, the improvement comprising a cylindrical nozzle adapted to project said material into space through a chosen path, and means, including a multiple-jet spray gun head mounted on the end of said nozzle, which head has a liquid adhesive chamber and a compressed air chamber, with a series of differently pitched atomizing jets alternately arranged in aid head communicating with said adhesive and air chambers simultaneously to project a plurality of cone-like sprays of said adhesive, said adhesive sprays being differently pitched relative to the chosen path of said material and converging with the chosen path of said material at difierent points.

5. In a gun of the type adapted to spray a divided material and a liquid adhesive whereby said material is rendered adherent for application to selected surfaces, the improvement comprising means to project said divided material into space through a chosen path, and means, including a series of difierently pitched jets cooperatively associated with said first named means, simultaneously to project a plurality of cone-like sprays of said adhesive, said adhesive sprays being differently pitched relative to the chosen path of said material and converging with the chosen path of said material at different points, each of said jets having an outlet terminating in an expanded orifice, whereby to provide an expanded cone-like spread of said spray.

6. In the art of spraying a divided material and an adhesive, whereby the material is rendered adherent for application to selected surfaces, the improvement comprising simultaneously projecting a spray of said material and a plurality of cone-like sprays of said adhesive, said adhesive sprays being diiierently pitched relative to the chosen path of said material and converging with the chosen path of said material at different points. v

ARTHUR J. LAMPE.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,303,280 Jenkins Nov. 24, 1942 1,718,507 Wenzel et a1. June 25, 1929 2,179,678 Wenzel Nov. 14, 1939 1,881,345 Beatty et a1 Oct. 4, 1932 

